Green, yellow, and orange defect emission from ZnO nanostructures: Influence of excitation wavelength
2006; American Institute of Physics; Volume: 88; Issue: 10 Linguagem: Inglês
10.1063/1.2182096
ISSN1520-8842
AutoresAleksandra B. Djurišić, Y. H. Leung, K. H. Tam, Lu Ding, Weikun Ge, H. Y. Chen, Shangjr Gwo,
Tópico(s)Gas Sensing Nanomaterials and Sensors
ResumoZnO commonly exhibits luminescence in the visible spectral range due to different intrinsic defects. In order to study defect emissions, photoluminescence from ZnO nanostructures prepared by different methods (needles, rods, shells) was measured as a function of excitation wavelength and temperature. Under excitation at 325nm, needles exhibited orange-red defect emission, rods exhibited yellow defect emission, while shells exhibited green defect emission. Obvious color change from orange to green was observed for needles with increasing excitation wavelengths, while nanorods (yellow) showed smaller wavelength shift and shells (green) showed no significant spectral shift. Reasons for different wavelength dependences are discussed.
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